Question

What is the electric flux associated with one of faces of a cube, when a charge (q) is enclosed in the cube ?

• A. $\frac{6q}{{\epsilon }_0}$
• B. $\frac{q}{6{\epsilon }_0}$
• C. $\frac{q}{3{\epsilon }_0}$
• D. $\frac{3q}{{\epsilon }_0}$

Answer 1

Answer: (B)

Charge q is lying inside the cube. Flux coming out of it $=\frac{q}{{\in }_0}$. It is now distributed evenly over six faces. So, flux passing through one face
$=\frac{q}{{\in }_0}\times \frac{1}{6}=\frac{q}{6{\in }_0}$